Activity : fixed duration and no assignmen don't change state with progress

Hello,

i'm using fixed duration for activities with no assignment.
So, creating activity with fixed duration of 40 days and 20 of validated work.

As i reprot earlier, it is impossible to change progress in planning view (i see tickets records for that).
But, if i change progress via activity screen, state doesn't change (activity stay recorded with 30% progress - must be "en cours" - even with 100% progress (must be "done").

Related states exists in workflow for that activity type.
"recorded" is the first status, as usual (id #1, order 100)
"en cours" is the first "In progress" status (id #3,order 300)
"fait" is the first "done" status (id #4, order 400)

all state are accessible by user profile in workflow.

Can't reproduce on demo, i think option "manuel progress of fixed-duration activities" is not set to YES.

Regards,
 

Note that status don't change via Timesheet (see demo, activity #13).

For testing, i use "as soon as possible" for activity planning